Broken Power Supply?

I own a 450w power supply that came with my case. Today out of nowhere the monitor turned off sound went away and lights on the keyboard went out. It wasnt like a reboot, it was just a simaltenaous shutdown of all of my hardware. However the lights inside of the PC were still going and i could still hear everything whirring.

So I turn it off and turn it on, and get nothing. The lights are on inside, and i can seen everything whirring but no picture on the monitor (The light stays orange never turns green). I put in a backup hardrive, nothing, I change the power cords, nothing, I flip the voltage switched on the back of the pc to different watts and reboot. Nothing still. I change monitors, nothing still.

I had a suspiscion it could have something to do with my video card, but that wouldn't explain why my keyboard and mouse dont register and light up.

So I'm led to believe it is the power supply that is causing this problem. Everything inside starts and whirrs but it doesnt seem to be getting enough power.

Since it happened out of nowhere and randomly there is nothing that could've triggered this that I know of that I can retrace. Would a dead or dying power supply show these syptoms?

>>1 I flip the voltage switched on the back of the pc to different watts and reboot.
The voltage switch you flipped will only change the expected input voltage. If it was set to 110v and you plugged it into 220v, your PSU is toast.

I've had this similiar problem once, the HDD led kept working, right after I plugged the cable, but no display or anything.

I changed my power supply and it worked again as usual. Maybe you should change it.

I think the problem is overheated.

>>2
My pc is around a year old, and is usually set to 220v so there is no worry since that is the highest voltage.

I get no messages of overheating and my room is fairly cold. I would suspect that I would at least be able to get into bios as well.

turn on your computer and leave for 20 minutes. come back, take off a side of the case, and feel the power supply. if it feels exceptionally hot, try and clean the dust out of the fan and (if you can) everything else in the power supply (with the comp off, of course). dust has fucked up my power supplies many times, and a year-old power supply would definitely need some cleaning. If that does not work, go and get a new power supply, preferably one with 500w. I recommend the Antec Smartpower. It worked for me when I had the same problem you are having.

I got a nice 600W EnerMax PSU myself, it's nice and quiet and it adds this nifty little "bit extra" in all the voltage supplies. Not really meaningful, I know, but it's cool to see it when you check the BIOS System Health Monitor.
Also, they should make cleanable PSUs these days, seriously.